Please click your language flag. Bitte Sprachflagge klicken.


Information - Help 
ID = 21407
United States of America (USA)
Brand: Arcturus Radio Tube Co.; Newark, NJ
Tube type:  Wunderlich Tube   Detector 
Identical to WunderlichA-Auto = WA-Auto = A-Auto
Similar Tubes
Other characteristic (electr. data):
  69_Wunderlich ; 70_Wunderlich ; 92_Wunderlich ; KR22
Differences not known by us:
First year 1932 - - Data from my own collection

Base 6-Pin-Base U6A, old, USA
Filament Vf 6.3 Volts / If 0.4 Ampere / Indirect / Parallel, (AC/DC)
Description A triode had two intermeshed grids equally spaced from the single cathode and the plate. Used as a full wave detector (am) with additional LF-amplification.
It was made only with a 6 pin base with no cap. The original announcement in the press (July 1932) made at the same time as the 2.5 volt version, mentioned both 5 and 6-pin types. 
Text in other languages (may differ)
WunderlichA-Auto: Bob Millard collection
Fin Stewart

WunderlichA-Auto: W.H.
Wolfgang Holtmann


You reach this tube or valve page from a search after clicking the "tubes" tab or by clicking a tube on a radio model page. You will find thousands of tubes or valves with interesting links. You even can look up radio models with a certain tube line up. [rmxtube-en]